s+s-9=s+42

Solution for s+s-9=s+42 equation:

Simplifying
s + s + -9 = s + 42

Reorder the terms:
-9 + s + s = s + 42

Combine like terms: s + s = 2s
-9 + 2s = s + 42

Reorder the terms:
-9 + 2s = 42 + s

Solving
-9 + 2s = 42 + s

Solving for variable 's'.

Move all terms containing s to the left, all other terms to the right.

Add '-1s' to each side of the equation.
-9 + 2s + -1s = 42 + s + -1s

Combine like terms: 2s + -1s = 1s
-9 + 1s = 42 + s + -1s

Combine like terms: s + -1s = 0
-9 + 1s = 42 + 0
-9 + 1s = 42

Add '9' to each side of the equation.
-9 + 9 + 1s = 42 + 9

Combine like terms: -9 + 9 = 0
0 + 1s = 42 + 9
1s = 42 + 9

Combine like terms: 42 + 9 = 51
1s = 51

Divide each side by '1'.
s = 51

Simplifying
s = 51